diff --git a/ruoyi-oa/src/main/java/com/ruoyi/oa/controller/OaExchangeRateController.java b/ruoyi-oa/src/main/java/com/ruoyi/oa/controller/OaExchangeRateController.java
new file mode 100644
index 0000000..32b7330
--- /dev/null
+++ b/ruoyi-oa/src/main/java/com/ruoyi/oa/controller/OaExchangeRateController.java
@@ -0,0 +1,32 @@
+package com.ruoyi.oa.controller;
+
+import com.ruoyi.common.core.controller.BaseController;
+import com.ruoyi.oa.service.IExchangeRateService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.math.BigDecimal;
+import java.util.Date;
+
+@RestController
+@Validated
+@RequiredArgsConstructor
+@RequestMapping("/oa/exchangeRate")
+public class OaExchangeRateController extends BaseController {
+    private final IExchangeRateService oaExchangeRateService;
+
+    /**
+     * 获取指定日期的美元兑人民币汇率
+     */
+    @GetMapping("/usd2cny")
+    public BigDecimal getUsd2CnyRate(@RequestParam(required = false) Date date) {
+        if (date == null) {
+            date = new Date();
+        }
+        return oaExchangeRateService.getUsdExchangeRate(date);
+    }
+}
\ No newline at end of file
diff --git a/ruoyi-oa/src/main/java/com/ruoyi/oa/domain/bo/OaProjectReportBo.java b/ruoyi-oa/src/main/java/com/ruoyi/oa/domain/bo/OaProjectReportBo.java
index a7d09ab..909dec0 100644
--- a/ruoyi-oa/src/main/java/com/ruoyi/oa/domain/bo/OaProjectReportBo.java
+++ b/ruoyi-oa/src/main/java/com/ruoyi/oa/domain/bo/OaProjectReportBo.java
@@ -84,6 +84,12 @@ public class OaProjectReportBo extends BaseEntity {
      */
     private Long workType;
 
+    /**
+     * 修改创建时间
+     */
+    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
+    private Date time;
+
     // 新增：多用户ID和时间范围
     private List<Long> userIds;
     @JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8")
diff --git a/ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProjectReportServiceImpl.java b/ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProjectReportServiceImpl.java
index 98fb0a3..cdefd88 100644
--- a/ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProjectReportServiceImpl.java
+++ b/ruoyi-oa/src/main/java/com/ruoyi/oa/service/impl/OaProjectReportServiceImpl.java
@@ -130,6 +130,10 @@ public class OaProjectReportServiceImpl implements IOaProjectReportService {
     @Override
     public Boolean updateByBo(OaProjectReportBo bo) {
         OaProjectReport update = BeanUtil.toBean(bo, OaProjectReport.class);
+        // 如果time字段不为空，则用time覆盖createTime
+        if (bo.getTime() != null) {
+            update.setCreateTime(bo.getTime());
+        }
         validEntityBeforeSave(update);
         return baseMapper.updateById(update) > 0;
     }